Invalid breadcrumb level

[TheLevti]

Based on your documentation breadcrumbs support the level debug, info, warning, error and fatal (see screenshot).

But the Breadcrumb class has a constant with the value critical, which is part of the allowed levels array (instead of a fatal level), which is also used for validation in the constructor (Breadcrumb.php#L64).

This issue causes confusion and conflict when translating PSR3 log levels to sentry breadcrumb levels. In addition neither the level critical nor the level fatal have special highlighting on a sentry exception. Only warning and error status receive a meaningful styling.

Please clearify which is now correct, critical or fatal. Either way please update the documentation and/or the php sdk. If fatal is the correct one, I would suggest adding the correct constant and deprecating the critical one.